Cascader allows inputing disabled values while searching

[TomNaessens]

English user, translated template:

Environment(required)

• antd version: 2.6.4
• OS and its version: All
• Browser and its version: Chrome, FF (others may too, only tested there)

What did you do? Please provide steps to re-produce your problem.

1. Add a cascader
2. Enable showSearch
3. Add an onChange callback
4. Add some disabled options
5. Search for the disabled option
6. Click it

What do you expected?

I expected not to be able to click on the disabled option

What happen?

The disabled value got sent to onChange

Re-producible online demo

Search for Zhong Hua men on:
http://codepen.io/anon/pen/PWjarP

[benjycui]

We should not show disabled option while searching.

Should show but not clickable.

[lock]

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